Over-voltage protection device for resonant wireless power transmission device and method for controlling the over-voltage protection device

• US 9,065,276 B2
• Filed: 12/20/2012
• Issued: 06/23/2015
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yu-Su, Park, Se-Ho, Byun, Kang-Ho, Yeo, Sung-Ku
• Primary Examiner(s): Leja, Ronald W
• Application Number:
  US13/722,211
• Publication Number:
  US 20130176652A1
• Time in Patent Office: 915 Days
• Field of Search: 361/86, 361/113, 307/104
• US Class Current: 1/1
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02H 3/20 responsive to excess voltage
• CPC Class Codes: H02H 9/045 adapted to a particular application and not provided for elsewhere
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

Provided is an over-voltage protection device for a resonant wireless power transmission device. The over-voltage protection device includes an amplifier for amplifying a transmission signal, a resonance signal generator for generating a wireless resonance signal according to the transmission signal amplified by the amplifier, a voltage detector for sensing a voltage of the wireless resonance signal generated by the resonance signal generator, and a controller for monitoring the voltage detected by the voltage detector to determine whether the voltage repetitively increases and decreases with periodicity when the voltage is greater than a reference voltage and controlling the amplifier to decrease an output of the transmission device by a value according to a result of the determination.

Claims

1. An over-voltage protection device for a resonant wireless power transmission device, the over-voltage protection device comprising:

an amplifier for amplifying a transmission signal;

a resonance signal generator for generating a wireless resonance signal according to the transmission signal amplified by the amplifier;

a voltage detector for sensing a voltage of the wireless resonance signal generated by the resonance signal generator; and

a controller for monitoring the voltage detected by the voltage detector to determine whether the voltage repetitively increases and decreases with periodicity when the voltage is greater than a reference voltage and when it is determined that the voltage is greater than a reference voltage and it is determined that the voltage of the resonance stage repetitively increases and decreases at a predetermined interval, controlling the amplifier to decrease an output of the transmission device by a value.

2. The over-voltage protection device of claim 1, wherein the periodicity of the voltage detected by the voltage detector is 500 microseconds (μ

S)-2 milliseconds (mS).

3. The over-voltage protection device of claim 1, wherein the amplifier is controlled to decrease the output of the transmission device by at least 30%.

4. The over-voltage protection device of claim 2, wherein the amplifier is controlled to decrease the output of the transmission device by at least 30%.

5. The over-voltage protection device of claim 1, wherein the amplifier is controlled to shut down the output of the transmission device during a preset period.

6. The over-voltage protection device of claim 2, wherein the amplifier is controlled to shut down the output of the transmission device during a preset period.

7. An over-voltage protection method of an over-voltage protection device for a resonant wireless power transmission device, the over-voltage protection method comprising:

monitoring a voltage of a wireless resonance signal of a resonance stage;

determining whether the voltage of the resonance stage, when the voltage is greater than a reference voltage, repetitively increases and decreases with periodicity; and

when it is determined that the voltage is greater than a reference voltage and it is determined that the voltage of the resonance stage repetitively increases and decreases at a pre-determined interval, decreasing an output of the transmission device by a value.

8. The over-voltage protection method of claim 7, wherein the periodicity of the voltage of the resonance stage is 500 microseconds (μ

S)-2 milliseconds (mS).

9. The over-voltage protection method of claim 7, wherein decreasing the output of the transmission device by the preset value comprises decreasing the output of the transmission device by at least 30%.

10. The over-voltage protection method of claim 8, wherein decreasing the output of the transmission device by the preset value comprises decreasing the output of the transmission device by at least 30%.

11. The over-voltage protection method of claim 7, wherein decreasing the output of the transmission device by the preset value comprises shutting down the output of the transmission device during a period.

12. The over-voltage protection method of claim 8, wherein decreasing the output of the transmission device by the preset value comprises shutting down the output of the transmission device during a period.